feat: generate image catalogs for bake images (#305)

Generate default cluster image catalogs for all combinations of types and OS  
versions, including all supported PostgreSQL versions. The catalogs also include  
predefined labels to easily identify the type, OS version, date, and origin of  
the catalog.

Closes cloudnative-pg/artifacts#1

Signed-off-by: Niccolò Fei <niccolo.fei@enterprisedb.com>
Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Co-authored-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>

.github/workflows/bake.yml

@@ -51,3 +51,15 @@ jobs:
     with:
       environment: ${{ github.event.inputs.environment }}
       postgresql_version: ${{ matrix.version }}
+
+  Catalogs:
+    name: Update Catalogs
+    needs: Bake
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: write
+    steps:
+       - name: Repository Dispatch
+         uses: peter-evans/repository-dispatch@ff45666b9427631e3450c54a1bcbee4d9ff4d7c0 # v3
+         with:
+           event-type: update-catalogs